Can I vibe code ElevenLabs?

Build an async Python FastAPI service that replicates ElevenLabs' core Text-to-Speech (TTS) and Voice Cloning API endpoints using open-source models. 

Integrate the `coqui-tts` or `StyleTTS2` library with PyTorch for audio synthesis. Implement two main API routes:

1. `POST /v1/text-to-speech/{voice_id}/stream`:
   - Accepts a JSON payload containing `text`, `model_id`, and `voice_settings` (stability, similarity_boost).
   - Generates audio chunk by chunk using a generator function and streams the raw MP3/PCM audio back to the client via `StreamingResponse` with `media_type="audio/mpeg"`.
   - Optimized for sub-second first-chunk latency.

2. `POST /v1/voices/add`:
   - Accepts multipart form data containing `name`, `description`, and a list of audio sample files (`files`).
   - Validates audio formats (WAV, MP3, FLAC) and extracts speaker embeddings using a pre-trained speaker encoder (e.g., SpeechBrain or Resemblyzer).
   - Saves the target voice vector to a PostgreSQL database using `pgvector` alongside voice metadata.

Database & Storage Schema:
- Table `voices`: `id` (UUID), `name` (text), `embedding` (vector), `created_at` (timestamp).
- Table `usage_logs`: `id` (UUID), `api_key` (text), `character_count` (int), `latency_ms` (int).

Failure Modes & Edge Cases:
- Return 422 if text exceeds max character limit (5,000 chars per request).
- Handle CUDA Out-Of-Memory (OOM) errors gracefully by returning a 503 Service Unavailable with a `Retry-After` header.
- Reject voice cloning uploads shorter than 3 seconds or longer than 10 minutes.

Out of Scope:
- Web dashboard or UI.
- Billing system, Stripe integrations, or user subscription management.
- Real-time WebRTC conversational AI orchestration loops.

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